Match ends, Newcastle United 3, Cardiff City 0.
Cardiff have been relegated from the Premier League after a single season, with defeat at Newcastle sending the Welsh side back to the Championship.
Newcastle, who had lost their previous six games, took the lead through Shola Ameobi's first-half header.
A sizeable number of Magpies fans walked out after 69 minutes in protest at the running of the club.
They missed a brief rally from Cardiff before late goals from Loic Remy and Steven Taylor sealed their fate.
Newcastle's rotten recent form was partly behind the open mutiny from their fans, but the supporters who stayed until the end were able to celebrate what turned out to be a comfortable victory.
Cardiff boss Ole Gunnar Solskjaer won 2-1 at St James' Park in his first game in charge of the Bluebirds - an FA Cup tie in January - but his side never seriously looked capable of staging a repeat.
Solskjaer has picked up just 12 points in his 17 league matches in charge and his side's deficiencies at both ends of the pitch were clear to see.
Fraizer Campbell missed a good early chance to put the visitors ahead, scuffing his shot wide after Tim Krul made a hash of Fabio's cross.
But Newcastle were already looking far more dangerous, with Moussa Sissoko and Mathieu Debuchy facing little resistance as they staged repeated raids down the right.
Remy saw one effort blocked from a Sissoko cross, before Debuchy advanced from right-back and flashed in a shot that David Marshall pushed away.
From the resulting corner, Debuchy saw Marshall claw his header onto the bar but there was no stopping Ameobi's far-post header after more good work by Sissoko.
The French midfielder made his side's first goal with a precise cross and twice almost extended their lead, seeing first a shot and then a cross deflected against the woodwork.
Cardiff's best hope of a reply seemed to lie with Wilfried Zaha but the on-loan Manchester United forward was denied by Krul's outstretched leg after a mazy run and faded after the break.
In truth, there was little fight from Zaha's team-mates either and Cardiff looked like dropping out of the top-flight with a whimper until Kenwyne Jones came off the bench with 17 minutes to go.
By then, with their relegation rivals Sunderland leading Manchester United at Old Trafford, the Bluebirds needed a win to keep their survival hopes alive until the final day.
Jones had an immediate impact, forcing a point-blank stop from Krul, but Cardiff's frustration continued when Fabricio Coloccini somehow cleared Aron Gunnarsson's shot off the line with his keeper beaten.
Many home fans had already departed by then, after another public display of displeasure against club owner, Mike Ashley, and manager Alan Pardew.
Ashley was not present but Pardew, back in the home dug-out for the first time since 1 March after a ban, was given something to smile about before the end.
Remy was left alone to slot home from six yards with three minutes left and Taylor completed the scoring from even closer after Remy's header was saved.
Newcastle manager Alan Pardew on the Magpies fans' protests:
"It is understandable. We had gone so long without winning and they are very frustrated. They want to see us challenging at the top of the league.
"That is difficult with the finances that we have, but we have got the chance in the summer to hopefully to bring in some quality players and try to get into the top five or six.
"We are all frustrated. But I have to take my hat off to the players because the environment was very, very tough for them and they showed tremendous character. It was that depth of character that we needed."
For a gallery of photos from Saturday's Premier League action, head to the BBC Sport Facebook page.
- 26DebuchyBooked at 68mins
- 36DummettSubstituted forHaidaraat 45'minutes
- 8AnitaSubstituted forTaylorat 79'minutes
- 11GouffranSubstituted forGoslingat 70'minutes
- 18de Jong
- 43A Armstrong
- 35da SilvaSubstituted forWolff Eikremat 86'minutes
- 10CampbellSubstituted forJonesat 73'minutes
- 13KimSubstituted forBellamyat 45'minutes
- 15Wolff Eikrem
- Martin Atkinson
- Shots on Target
Second Half ends, Newcastle United 3, Cardiff City 0.
Corner, Newcastle United. Conceded by David Marshall.
Attempt saved. Moussa Sissoko (Newcastle United) right footed shot from the right side of the box is saved in the top right corner. Assisted by Fabricio Coloccini.
Corner, Cardiff City. Conceded by Steven Taylor.
Goal! Newcastle United 3, Cardiff City 0. Steven Taylor (Newcastle United) header from very close range to the centre of the goal. Assisted by Loïc Remy following a corner.
Attempt blocked. Loïc Remy (Newcastle United) header from the centre of the box is blocked. Assisted by Dan Gosling with a cross.
Corner, Newcastle United. Conceded by Ben Turner.
Attempt blocked. Moussa Sissoko (Newcastle United) right footed shot from the centre of the box is blocked. Assisted by Cheick Tioté.
Goal! Newcastle United 2, Cardiff City 0. Loïc Remy (Newcastle United) right footed shot from the centre of the box to the bottom left corner.
Attempt blocked. Cheick Tioté (Newcastle United) right footed shot from the right side of the box is blocked. Assisted by Moussa Sissoko.
Foul by Cheick Tioté (Newcastle United).
Aron Gunnarsson (Cardiff City) wins a free kick in the defensive half.
Substitution, Cardiff City. Magnus Wolff Eikrem replaces Fabio.
Attempt blocked. Craig Bellamy (Cardiff City) right footed shot from outside the box is blocked.
Offside, Cardiff City. Peter Whittingham tries a through ball, but Craig Bellamy is caught offside.
Massadio Haidara (Newcastle United) wins a free kick on the left wing.
Foul by Jordon Mutch (Cardiff City).
Substitution, Newcastle United. Steven Taylor replaces Vurnon Anita.
Corner, Newcastle United. Conceded by Steven Caulker.